Fix: nightly packages / gitignore template and fie

[danoli3]

• Fixes :nightly package: missing .gitignore for template
• Fixes .gitignore for examples is missing PG-generated (linux) makefiles #6021 project generator added elements to examples.

• Added osx script to test all graphics projects / setup via project generator if not, build and run each example

• Fixes: no .gitignore is created when using gitignore template (iOS, nightly version) projectGenerator#477

[danoli3]

Fixes openframeworks/projectGenerator#477

[ofTheo]

Think this is still broken no?

I manually ran the manual-nightly yesterday to get some up to date nightly builds, but I think something in the changes from this PR has broken the automated nightly build.

Once it's working again could we leave the scheduled nightly as is, and then test new changes with a duplicate workflow until it's proved to work?

[ofTheo]

Okay fixed the syntax issues and made it so it could be run manually too.

Looks like its working now:
https://github.com/openframeworks/openFrameworks/releases/tag/nightly